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O-ring G

P (dynamic)JIS B 2401-1 / -2This series can be used for both dynamic and static seals. It has the most sizes and is the one generally used. The housing dimensions are on the same page.G (static)JIS B 2401-1 / -2This series is for static seals only. Do not use it for dynamic seals. The housing dimensions are on the same page.V (for vacuum flanges)ISO 3601-1 (JIS B 2401-1)This series is for vacuum flanges. The cross-sections are large at 4, 6 and 10 mm, and some are large in diameter.F (ISO general industrial)JIS B 2401-2 Annex JAThe ISO 3601-2 size series. Its designation numbers follow a different system from P, G and V, and only the basic dimensions for each cross-section are given.

O-ring G (static) dimensions

This series is for static seals only. Do not use it for dynamic seals.

Diagram: O-rings O-ring G
Dimensions to show
Show tolerances
Designation numberO-ring itselfHousing (cylindrical face)Housing (flat face)
Inside diameter d1Cross-section d2Outside diameter (reference)d3, d5d4, d6b1
None		b2
1 piece		b3
2 pieces		r1
Max.		E
Max.		Back-up
Spiral		Back-up
Bias cut		Back-up
Endless		z
Min.		SqueezeSqueeze ratio [%]d8
For external pressure		d7
For internal pressure		b4hr1
Max.		z
Min.		SqueezeSqueeze ratio [%]

Notes

  • References
    • JIS B 2401-1(2012)
    • JIS B 2401-2(2012)
    • JIS B 0401-1(2016)
    • JIS B 0401-2(2016)
  • The tolerances are for NBR. Multiply by 1.5 for VMQ and ACM, and by 1.2 for FKM and HNBR.
  • The back-up ring thickness is for PTFE. The groove width depends on how many are fitted: b1 (none), b2 (one) or b3 (two).

Related pages

Oリング溝設計
O-ring groove design

Pick a designation and the cord diameter, groove depth and groove width are filled in; squeeze, squeeze ratio and fill rate follow. Squeeze and squeeze ratio are checked against the ranges in JIS.

O-rings — O-ring G — O-Ring Dimensions | Updraft - Mechanical Engineering Calculators